Your custom VRC7 instrument is off by a 5th. This means the note that is being displayed is not the one we are hearing. You can fix this by changing the Mult.factor.

About the song: I like the change in frame 06.I like the bass pattern idea. Some articulations like staccato could make it even better imo.The riff in FM Channel is pretty repetitive. You could expand on it and turn it into a melody. Also there is lots of space for some harmony or counter melodies if you feel like it.The A# in the counter line in FM channel 2 is a bit dissonant to my ears but you can probably make it work somehow. The drums are unusual indeed. The snare is fighting a bit with the Noise instrument.

I get a kick out of arranging your songs so that's what I did with this one. I hope you don't mind. Needless to say I took lots of creative liberties but I tried to keep the basic bass pattern and the melody.